Requirements Engineering (RE) is a well-established discipline where a wide range of approaches, techniques, and tools have been proposed. Systematic attempts to evaluate and compare usefulness, effectiveness, and usability of such proposals resulted in a growing attention to methods for empirical assessment. Empirical Software Engineering (ESE) aims at applying the empirical research methodologies to the software engineering field. In other terms, it aims at studying and proposing qualitative and quantitative methods to collect and analyze evidence that helps evaluate software engineering approaches, techniques and tools. Design science, action research, case studies and experiments, hence, become indispensable and valuable ways to check proposals with respect to reality, thus allowing us to understand their actual value, cost, and benefits in particular contexts. The objective of the EmpiRE workshop series is to increase the cross-fertilization of ESE methods and RE by actively encouraging the exchange of ideas to understand why and how the empirical methods from ESE can help to assess and improve existing or new approaches in RE. Building on the success of seven workshop editions in the period of 2011-2018, the goal of the proposed 8th edition of EmpiRE is to shape the next phase of cross-fertilization of RE and ESE, specifically: (i) to open up the interdisciplinary debate on the steadily moving frontiers in empirical RE, and (ii) to extend the network of RE and ESE researchers designing and conducting empirical studies in RE, which in turn will lead to the cross-fertilization between RE and ESE.